Improvement in rock-drill carriages



G. E. TUWNE & W. W. BAILEY.

Rock-Drill Carriages.

No. 138,959, PatentedMay Wz' Znesscs,

2 Sheets-Sheetl.

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28 G. E. TUWNE 8|. W. W. BAILEY.

heets--Sheet 2.

Ruck-Drill Carriages.

Patented May13, 1873.

No. l38,959.

In In: n 2v rs,

xwl. PHOTD-LITHOBRAPH/C c0. 111(osaoms Francs-95) UNITED STATES PATENTOrrrcn GEORGE E. TOWNE AND WILLIAM W. BAILEY, OF FITOHBT IRG, MASS,ASSIGN- ORS TO BURLEIG-H ROCK-DRILL COMPANY, OF SAME PLACE.

IMPROVEMENT IN ROCK-DRILL CARRIAG'ES.

Specification forming part of Letters Patent No. 138,959, dated May 13,1873 application filed February 7, 1873.

To all whom it may concern:

Be it known that we, GEORGE E. TOWNE and WILLIAM W. BAILEY, both ofFitchburg, in the county of Worcester and State of Massachusetts, haveinvented an Improvement in Rock-Drill Carriages; and we do herebydeclare that the following, taken in connection with the drawing whichaccompanies and forms part of this specification, is a description ofour invention sufficient to enable those skilled in the art to practiceit.

In United States Letters Patent No. 80,387 there is shown adrill-carriage in which the drill stocks or holders are secured to barsfixed or adjustably fastened to the carriageframe, the carriage beingprovided with carwheels, or made as a truck to run upon the railway, andthe frame of the carriage being made open, or without cross-bars, thecarriage being thereby enabled to run over the broken rock lying betweenthe rails, and also enabling a car-truck to run through it uponanarrower track, to removethe debris without interrupting the progressof the drilling operations. Although such carriage has been an importantadjunct in tunneling operations, there is sometimes difficulty inrunning it up to reach the breast or face of the rock, on account of thedbris in front of the carriage, and the drillbars upon such carriagecannot be readily raised, or lowered, or adjusted in position, andcannot be jacked without leaving the carriage subject to the strainsproduced by the drill blows.

To remedy these defects, we have made an open carriage, with thedrill-holding bar overhung, so that the drills are projected entirelybeyond the open frame, and have capabilities of more ready adjustmentthan are possessed by the drills mounted upon bars directly fixed to thecarriage-frame. For this purpose we fasten the drill-holding cross-barto the outer ends of two long arms, whose inner ends are pivoted to theopen carriage-frame at some distance back from the front end thereof,these arms swinging vertically, or being capable of vertical movementupon their pivots, to raise and lower and position the drillbar,

the arms being connected, by a chain and pulley mechanism, with awindlassor windingwheels fixed on a shaft, by turning and setting whichthe drill-bar is brought to and held in position. These arms projectbeyond the ends of the carriage-frame, thereby enabling the drills toreach the rock without necessity of movement of the carriage up to theface against which the drills are to work, the open frame permitting thedebris to be drawn through it while the drills are in operation.

Our invention consists in this construction or provision, or in anopen-framed drill-carriage having a drill-bar standing in front of thecarriage, and fixed upon the front ends of long arms pivoted to the opencarriage-frame, and preferably at a distance from the front thereofequal to or in excess of the length projecting beyond the carriage.

The drawing represents a drill-carriage embodying our invention.

Figure 1 shows the machine in side elevation. Fig. 2 is a plan of thefront part of the carriage. Fig. 3 is an end view of the car riage.

a denotes the open frame of the carriage, resting upon the short axlesof wheels I), which fit to and run upon the rails c, the frame beingmade without any cross beams or ties except at top, the short axles andthe absence of the cross-bars below the top of the frame leaving an opencarriage, free from any obstacle to prevent its running over rock,which, beingthrown down in front of the car ria-ge by the operations ofthe drills, needs only to be cleared from the rails to enable thecarriage to run over it. (I denotes the drillbar, located in front ofand beyond this open carriage, as seen in the drawing, and fixed to theouter ends of two long arms or pivot-bars, e e, which are pivoted to theframe, as seen at f, the arms 0 e passing through vertical slots g atthe front end of the frame, and swinging freely in vertical directionsin these slots. Fastened to the arms 6 e are chains h, which extend overguide-sheaves c, and thence to wheels 10 on a shaft, 1, so that byturning the shaft the arms 6 e are raised or lowered, and

the drill-bar is thus brought to the desired porier, arranged to operatesubstantially as desition, at which position it is fastened by thescribed;

bracing-screws m, which are turned outward- Executed this 25th day ofJanuary, A. D.

1y until, by acting against the sides of the 1873. shaft, they jack thebar and hold it fast in p'o- GEO. E. TOWN E.

sition. W. W. BAILEY.

We claim Witnesses:

A drill-carriage having, in combination FRANCIS GOULD, with an openframe, the pivoted drill-bar ear- M. W. FROTHINGHAM.

